I find it astonishing that the publisher Gibbs Smith allowed this book to be printed with the subtitle "An Anthology of Intentional Assaults Upon The English Language". This is NOT an anthology of puns. Rather, it is a sort of text book, explaining in incredibly patronising terms what a pun IS (and not always getting it right, by the way) with 'fill in the blanks' sections, reminiscent of begginers' foreign language textbooks. If you already know what a pun is, then this book is not for you. If you don't, then I can't imagine you'd want to buy a book about puns in the first place.
I can see a potential use of this book, however, in helping advanced students of English as a foreign language, in getting to grips with the nuances of English wordplay, which can be a little baffling to those who are not native speakers.